package com.yb.web.controller.system;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;

@Controller
public class LoginCotroller {
	
	private Logger logger = LoggerFactory.getLogger(LoginCotroller.class.getName());
	
	@GetMapping("/login")
	public String login() {
		return "login";
	}
	
	/**
	 * 生成验证码
	 */
	@GetMapping("/createValidateCodeImg")
	public void validateCodeImg(HttpServletResponse response, HttpSession session) {
		try {
			response.setHeader("Pragma", "No-cache");
			response.setHeader("Cache-Control", "no-cache");
			response.setDateHeader("Expires", 0);
			response.reset();
			int width = 60, height = 20;
			BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
			Graphics g = image.getGraphics();
			Random random = new Random();
			g.setColor(getRandColor(200, 250));
			g.fillRect(0, 0, width, height);
			g.setFont(new Font("Times New Roman", Font.PLAIN, 18));
			g.setColor(new Color(255, 255, 255));
			g.drawRect(0, 0, width - 1, height - 1);
			g.setColor(getRandColor(160, 200));
			for (int i = 0; i < 155; i++) {
				int x = random.nextInt(width);
				int y = random.nextInt(height);
				int xl = random.nextInt(12);
				int yl = random.nextInt(12);
				g.drawLine(x, y, x + xl, y + yl);
			}
			String sRand = "";
			for (int i = 0; i < 4; i++) {
				String rand = String.valueOf(random.nextInt(10));
				sRand = sRand + rand;
				g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
				g.drawString(rand, 13 * i + 6, 16);
			}
			session.setAttribute("code", sRand);
			g.dispose();
			ImageIO.write(image, "JPEG", response.getOutputStream());
			logger.info("生成验证码成功");
		} catch (Exception e) {
			logger.error("生成验证码失败", e);
		}
	}
	
	Color getRandColor(int fc, int bc) {
		Random random = new Random();
		if (fc > 255)
			fc = 255;
		if (bc > 255)
			bc = 255;
		int r = fc + random.nextInt(bc - fc);
		int g = fc + random.nextInt(bc - fc);
		int b = fc + random.nextInt(bc - fc);
		return new Color(r, g, b);
	}
}
